Segmented variable-angle variable-structure web-supported wind power blade

Abstract

The utility model provides a wind power blade supported by a segmented variable-angle variable-structure web, which belongs to the technical field of wind power generation, a blade main body is a hollow cavity, an upper main beam and a lower main beam are symmetrically arranged on the inner surface of the blade main body along the axis direction of the blade main body, and the blade main body is divided into three parts along the axis direction of the blade main body, namely a blade root, a blade body and a blade tail, the three webs are respectively positioned in the three parts of the blade main body; the three webs are the first web, the second web and the third web respectively, the first web is arranged in the axial direction of the blade root, the second web is arranged in the axial direction of the blade body, and the third web is arranged in the axial direction of the blade tail. According to the characteristics of the blade root, the blade body and the blade tail, web supporting structures matched with the blade root, the blade body and the blade tail are designed respectively, namely a first web is arranged at the blade root, a second web is arranged at the blade body and a third web is arranged at the blade tail, efficient utilization of the web supporting structures is achieved, and the overall structural strength of the blade is remarkably enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of wind power generation, concretely relates to a wind power blade of sectional variable angle variable structure web support. BACKGROUND

[0002] As a clean, non-polluting and sustainable new energy form, wind power generation has crucial significance for alleviating the current society's excessive dependence on conventional energy and the environmental pollution problems caused thereby. With the increasing demand for clean energy worldwide, blade damage problems are also becoming increasingly serious, and wind turbine blades often cause various technical problems and failures due to insufficient strength. At present, to improve the structural strength of wind turbine blades, there are mainly the following three improvement strategies: (1) material upgrading and optimization: this strategy focuses on using high-performance composite materials to strengthen the support structure of the blade. The use of high-performance composite materials can significantly improve the mechanical strength of the blade, thereby reducing the operation and maintenance cost. However, the implementation of this method is also accompanied by higher production cost and more complex manufacturing process, which is a key factor that needs to be weighed in actual application. (2) fine optimization of structural design: by fine adjustment and optimization of key geometric parameters such as the leading edge curvature, trailing edge curvature, thickness distribution and cross-sectional size of the blade, the mechanical properties and fluid mechanics characteristics of the blade can be significantly improved. This optimization strategy can improve the structural strength and power generation efficiency of the blade to a certain extent. However, its strength improvement effect is relatively limited, and optimization design often leads to increased complexity of the manufacturing process. (3) manufacturing process innovation and technology introduction: this strategy focuses on introducing advanced manufacturing technologies such as automated layup technology, vacuum assisted resin transfer molding (VARTM) and autoclave molding. The use of these advanced technologies can significantly improve the manufacturing precision and consistency of the blade, thereby reducing the scrap rate and indirectly improving the structural strength and production efficiency of the blade. However, the introduction of these new technologies is also accompanied by challenges in terms of technology maturity and reliability, as well as possible increases in manufacturing costs.

[0003] Through analysis of the existing situation, two problems can be found. First, although structural design optimization is widely used, it not only increases the complexity of the manufacturing process, but also has a relatively limited strength improvement effect. The material upgrading and optimization strategy results in a significant increase in cost due to the use of high-performance materials. Second, the current optimization methods mostly start from the overall perspective of the wind turbine blade, ignoring the differentiated needs of each region of the blade for strength optimization, making it difficult to achieve a comprehensive optimal strength distribution. SUMMARY

[0004] To make up for the above shortcomings, the utility model provides a wind power blade of sectional variable angle variable structure web support, which adjusts the web support structure of each region of the blade according to the unique stress requirements and functional characteristics of each region of the blade.

[0005] The present utility model is implemented as follows:

[0006] A wind power blade with a segmented variable-angle variable-structure web support, the wind power blade having a blade main body and a skin provided on its outer surface, the blade main body being a hollow cavity, and symmetrically provided with an upper main beam and a lower main beam on the inner surface of the main body along its axis direction, and three webs being provided between the upper main beam and the lower main beam; the blade main body is divided into three parts along its axis direction, namely a blade root, a blade body and a blade tip, and the three webs are respectively located in the three parts of the blade main body; the three webs are respectively a first web, a second web and a third web, and the first web is arranged along the axial direction of the blade root, the second web is arranged along the axial direction of the blade body, and the third web is arranged along the axial direction of the blade tip.

[0007] In addition, the wind power blade with a segmented variable-angle variable-structure web support in the above technical solution provided by the present utility model may further have the following additional technical features:

[0008] Further, the cross section of the first web is an "I" shape, and both ends of the first web are respectively connected to the upper main beam and the lower main beam and penetrate through the blade root.

[0009] Further, the second web is obliquely connected to the upper main beam and the lower main beam of the blade body with the rotational axis of the blade main body as the symmetry center and penetrates through the blade body.

[0010] Further, the cross section of the third web is a "square" shape, and both ends of it are respectively connected to the upper main beam and the lower main beam.

[0011] Further, the upper main beam and the lower main beam are embedded in the skin.

[0012] Further, two thickened main beams are provided on both the upper main beam and the lower main beam, and the two thickened main beams are respectively located at the joints of the blade root and the blade body and the blade body and the blade tip and penetrate through the blade tip.

[0013] Compared with the prior art, the present utility model has the following beneficial effects:

[0014] The utility model provides a kind of sectional variable-angle variable-structure web support of wind power blade, this design will blade main body be divided into blade root, blade body and blade tail three parts along its axial direction, respectively for the characteristics of blade root, blade body and blade tail, respectively design and it is adapted to web support structure, i.e. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed in the embodiments will be simply introduced below, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as limiting the scope, and for ordinary skilled in the art, other related drawings can be obtained without creative labor according to these drawings.

[0016] Figure 1 It is the whole structure schematic diagram of the utility model one kind sectional variable-angle variable-structure web support of wind power blade;

[0017] Figure 2 It is the internal support structure schematic diagram of blade main body;

[0018] Figure 3 It is the section schematic diagram of different parts (blade root, blade body, blade tail) in blade main body;

[0019] Figure 4 It is the section schematic diagram of first web;

[0020] Figure 5 It is the section schematic diagram of second web;

[0021] Figure 6 It is the section schematic diagram of third web;

[0022] Figure 7 It is the blade section schematic diagram at first web;

[0023] Figure 8This is a schematic diagram of the blade cross-section at the second web.

[0024] Figure 9 This is a schematic diagram of the blade cross-section at the third web.

[0025] In the diagram: 1. Blade body; 2. Skin; 3. Upper main beam; 31. Thickened main beam; 4. Lower main beam; 5. First web; 6. Second web; 7. Third web; 71. Right side plate; 72. Left side plate. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] A wind turbine blade with segmented variable angle and variable structure web support, such as Figures 1-3 As shown, the wind turbine blade consists of a blade body 1 and a skin 2 on its outer surface. The blade body 1 is a hollow cavity. An upper main beam 3 and a lower main beam 4 are symmetrically arranged on the inner surface of the body 1 along its axial direction, and three webs are arranged between the upper main beam 3 and the lower main beam 4. Figure 3 As shown, the blade body 1 is divided into three parts along its axial direction. Figure 3 Region a in the middle is the leaf root; Figure 3 The middle b region is the leaf blade; Figure 3 The middle c region is the leaf tail, and the three lobes are located in the three parts of the main body 1 of the leaf respectively; the three lobes are the first lobe 5, the second lobe 6 and the third lobe 7, and the first lobe 5 is set along the leaf root axis, the second lobe 6 is set along the leaf body axis, and the third lobe 7 is set along the leaf tail axis.

[0028] In view of the overall large size of the wind turbine blade body 1, it will be subjected to complex and variable stress during operation, and considering that the functions and stress characteristics of different regions of the blade body 1 are significantly different, the blade body 1 is scientifically divided into three parts, i.e. the blade root, the blade body and the blade tail, and on this basis, in view of the unique stress requirements and functional characteristics of the three parts, the blade root is the connecting area of the blade body 1 and the hub of the wind turbine, and bears the maximum bending moment and shear force, so the first web 5 is provided at the blade root, which can bear large vertical and horizontal loads and is suitable for high load occasions; the blade body is mainly responsible for capturing wind energy and converting it into mechanical energy, so the second web 6 is provided at the blade body, and the second web 6 bears bending load and shear force; and the blade tail although the stress is small, but its influence on the aerodynamic performance of the blade is significant, so the third web 7 is provided at the blade tail, which has high stability due to its unique shape design, can effectively resist external pressure and deformation, and ensures the integrity and safety of the structure when bearing large load.

[0029] Optionally, as shown in Figure 4 and Figure 7 , the cross section of the first web 5 is "I" shaped, and the two ends of the first web 5 are connected with the upper main beam 3 and the lower main beam 4 respectively and penetrate the blade root, and the "I" shape is composed of a vertical plate connecting the upper main beam 3 and the lower main beam 4 at both ends.

[0030] As a key connecting component of the wind power generation system, the blade root needs to bear complex loads such as aerodynamic force, gravity and centrifugal force, therefore, in order to meet the support requirements of high strength and high stiffness at the blade root, the first web 5 at the blade root is designed as an "I" shaped web support structure, which can bear large vertical and horizontal loads and is suitable for high load occasions, and its cross-sectional shape has high bending and transverse stiffness, effectively reducing stress deformation and displacement, and ensuring the stability and safety of the structure.

[0031] Optionally, as shown in Figure 5 and Figure 8 , the second web 6 is symmetrical to the rotation axis of the blade body 1, and is connected with the upper main beam 3 and the lower main beam 4 of the blade body at an angle (not 90° orthogonal) and penetrates the blade body.

[0032] The blade body part is subjected to multiple stresses of aerodynamic force, gravity and centrifugal force, and is prone to fatigue and vibration failure. Therefore, in order to meet the requirements of high strength, high rigidity and optimized aerodynamic layout of the support structure at the blade body, so as to reduce wind resistance and improve wind energy conversion efficiency, the second web 6 at the blade body is designed as an inclined web support structure, and the inclination angle thereof is determined according to the capacity, working condition and living environment of the wind turbine generator. The inclined web support structure can adjust the angle and attitude of the blade, so that the blade can maintain good performance at different wind speeds, and the blade can maintain the best aerodynamic performance at different wind speeds, thereby improving the power generation efficiency and stability of the wind turbine generator. The support angle (relative to the blade main shaft or horizontal plane) has an important influence on the aerodynamic performance and structural strength.

[0033] Optionally, as shown in Figure 6 and Figure 9 , the third web 7 has a "mouth" shaped cross section, and its two ends are connected with the upper main beam 3 and the lower main beam 4 respectively and penetrate through the blade tail. The third web 7 comprises a right side plate 71 and a left side plate 72, and the "mouth" shape is surrounded by the right side plate 71, the left side plate 72, the upper main beam 3 and the lower main beam 4.

[0034] The blade tail is subjected to stress concentration, is prone to large deformation and stress due to the action of wind, and is affected by large centrifugal force, and is prone to fatigue damage. Therefore, in order to enhance the stability, the third web 7 is designed as a "mouth" shaped web support structure. This structure has high stability due to its unique shape design, can effectively resist external pressure and deformation, and can ensure the integrity and safety of the structure under large load.

[0035] Optionally, as shown in Figure 2 , the upper main beam 3 and the lower main beam 4 are embedded in the skin 2.

[0036] By embedding and fusing the upper main beam 3 and the lower main beam 4 into the skin 2, the overall rigidity and bending resistance of the blade can be significantly improved. The integrated design enables the blade to better resist various loads encountered during operation, including bending moment, shear force and the like caused by wind. In addition, the overall weight can be reduced while ensuring the required strength, which not only reduces the burden of the wind turbine generator and improves the operating efficiency, but also reduces the risk of failure and prolongs the service life of the blade.

[0037] Optionally, as shown in Figure 2 , two thickened main beams 31 are arranged on the upper main beam 3 and the lower main beam 4 respectively, and the two thickened main beams 31 are located at the connection between the blade root and the blade body and the connection between the blade body and the blade tail respectively.

[0038] By setting the thickened main beam 31 at the connection between the blade root and the blade body and the blade body and the blade tail, the bending moment and shear force capacity of the area can be significantly increased, thereby preventing structural damage or failure caused by stress concentration, and by setting it as a smooth continuous change, the load can be more evenly distributed between different parts, reducing the stress concentration phenomenon caused by mutation. The thickened main beam 31 not only strengthens the local area, but also supports the entire blade structure by providing a more solid foundation.

[0039] Implementation process: the design divides the blade body 1 along its axial direction into three parts: blade root, blade body and blade tail. According to the characteristics of the blade root, blade body and blade tail, respectively, the web support structure is designed to adapt to it, that is, the first web 5 is arranged at the blade root, the second web 6 is arranged at the blade body and the third web 7 is arranged at the blade tail, realizing efficient use of the web support structure, significantly enhancing the overall structural strength of the blade, and effectively reducing the occurrence of potential failure modes. The webs in each region are integrated into a coordinated and unified overall support system by the upper and lower main beams 4. Therefore, the utility model not only improves the structural efficiency of the blade, but also brings significant lightweight effect. By optimizing the material of the support structure in each region, the overall weight of the blade is reduced. This change not only reduces the burden of the wind turbine and improves the operating efficiency, but also reduces the risk of failure and prolongs the service life of the wind turbine blade. In addition, the design also reduces the production cost, customizes the support structure according to the specific needs of each region, avoids unnecessary material waste, and makes the production material more accurate and efficient.

[0040] It should be noted that the specific model specifications and materials of the skin 2, the upper main beam 3, the lower main beam 4 and the thickened main beam 31 need to be selected and determined according to the actual specifications of the device, so they will not be described in detail.

[0041] The above is only a preferred embodiment of the utility model and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A wind turbine blade of segmented variable angle and variable structure web support, the wind turbine blade being a blade body (1) and having a skin (2) provided on an outer surface thereof, characterized in that, The blade body (1) is a hollow cavity, and an upper main beam (3) and a lower main beam (4) are symmetrically arranged on the inner surface of the blade body (1) and along the axial direction of the blade body (1), and three webs are arranged between the upper main beam (3) and the lower main beam (4); The blade body (1) is divided into three parts along the axial direction thereof, namely a blade root, a blade body and a blade tail, and the three webs are respectively located in the three parts of the blade body (1); The three webs are respectively a first web (5), a second web (6) and a third web (7), the first web (5) is arranged along the axial direction of the blade root, the second web (6) is arranged along the axial direction of the blade body, and the third web (7) is arranged along the axial direction of the blade tail.

2. A wind turbine blade with a segmented variable-angle variable-stiffness web support according to claim 1, characterized in that, The first web (5) is in the shape of an "I" in cross section, and the two ends of the first web (5) are connected with the upper main beam (3) and the lower main beam (4) and penetrate through the blade root.

3. A wind turbine blade with a segmented variable-angle variable-stiffness web support according to claim 1, characterized in that, The second web (6) is connected with the upper main beam (3) and the lower main beam (4) of the blade body (1) in an inclined manner with the rotation axis of the blade body (1) as the center of symmetry and penetrates through the blade body.

4. A wind turbine blade with a segmented variable-angle variable-stiffness web support according to claim 1, characterized in that, The third web (7) is in the shape of a "mouth" in cross section, and the two ends of the third web (7) are connected with the upper main beam (3) and the lower main beam (4) and penetrate through the blade tail.

5. A wind turbine blade with a segmented variable-angle variable-stiffness web support according to claim 1, characterized in that, The upper main beam (3) and the lower main beam (4) are embedded in the skin (2).

6. A wind turbine blade of segmented variable angle and variable structure web support according to claim 1, characterized in that, Two thickened main beams (31) are arranged on the upper main beam (3) and the lower main beam (4), and the two thickened main beams (31) are respectively located at the connection positions of the blade root and the blade body and the blade body and the blade tail.

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